Question

Which of the following is true?
a.) Rusting will take place in absence of water
b.) Rusting will take place in absence of air
c.) Rusting will not take place in presence of water and air
d.) None of the above

Answer 1

Hint: Certain metallic objects when left unused or stagnant for long periods of time develop changes on its surface; this change is called Corrosion which consequently leads to gradual degradation of the metallic objects.

Complete step by step answer:
Rusting is a simple chemical reaction which involves decaying of the metallic surface. Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust
In the given reaction of rusting, the iron surface chemically reacts with oxygen in the presence of water or atmospheric moisture to form stable Iron Oxides (Rust). Chemical reaction of rusting is as follows:
\[Fe+{{O}_{2}}\xrightarrow[\left( atmospheric\text{ }moisture \right)]{+{{H}_{2}}O}FeO+F{{e}_{2}}{{O}_{3}}\]

So, the correct answer is “Option D”.

Note: One is advised to remember that Rusting is basically one of the ways of corrosion in metals in which it results in the conversion of metal into its chemically stable form that can either be oxides, hydroxides of sulphides.
As option A, B and C are incorrect seeing the above solutions, so Option D that is None of the above is the correct option.